Oven for vapor or gas stoves



(No Model.)

L. LENTZ. OVEN FOR VAPOR OR GAS STOVES.

No. 589,972. Patented Sept. 14,1897.

UNITE OVEN FOR VAPOR OR GAS STOVES.

SPECIFICATION forming part of Letters Patent No. 589,97 2, datedSeptember 14;, 1897 Application filed February 21,1896. Serial No.580,178. (No. model.)

T0 to whom it may concern.-

Be it known that I, LUDWIG LENTZ, a citizen of the German Empire, and aresident of Covington, in the county of Kenton and State of Kentucky,have invented certain new and useful Improvements in Ovens for Vapor orGas Stoves, of which the following is a specification.

My invention relates to that class of ovens for use in connection withvapor or gas stoves the outer walls of which are composed of as bestosor similar non-conductingmaterial.

The object of the invention is to provide a secure means for holding theasbestos walls and door and providing communicating liveair chambers inthe end and top walls and means for controlling and direetin g theheated air or vapors through said chambers and ex eluding them from theoven or admit the vapors to the oven and allow the heat from the oven toescape when desired. I attain these objects by the means illustrated inthe accompanying drawings, in connection with which the invention willbe first fully described, and then particularly referred to and pointedout in the claims.

Referring to the drawings, Figure 1 is a perspective View of my improvedoven with the door thrown open and the valve in the bottom of the oventhrown down to admit vapors from the stove directly to the oven. Fig. 2is a longitudinal vertical section through line 00 0c of Fig. 1, lookingtoward the back of the oven, with the oven-valve shown closed in fullline and in dotted line in the same position it occupies in Fig. 1. Fig.3 is a detailed view of the lower part of the stove, in transversevertical section, with the door closed. Fig. at is a detail View, inhorizontal section, upon an enlarged scale, showing the vertical jointsof the oven. Fig. 5 is a" detail View, in vertical section, upon anenlarged scale, of one of the top and end corners, illustrating thebinding-frame holding the back, top, andend walls together. Fig. 6 is adetail view, in end elevation, of the top of the oven. Fig. 7 isan.inverted plan View of the valves or registers controlling the supply ofheat to the oven and permitting the heat and vapors from the oven andair-chambers to escape to the open air when desired.

Referring to the parts by reference-letter,

' A represents sheets of asbestos or other noneondueting material; B,sheet-metal frames which hold the asbestos sheets that form the ends andback of the oven and the air-chambers between the oven and the asbestoscovering. The sheet 13 has ends I) to bear against the inner face of theasbestos sheets to support them and also forming the air-chambers b. Thevertical edges of the sheets B are turned around in a vertical bend Zfi,forming grooves into which the asbestos sheets are slipped and held byrivets b passing through the outer bend b the asbestos sheet, and theinturned bend b, as clearly seen in Fig. 4, the metal being bent at theedges to form the angular interlocking joint I). The larger loops 5which form the air-chambers b,have inturned flanges b struck up fromthem, forming the perforations for the heated air to pass through theair-chain here, these lugs furnishing a support for the bottom shelf Cof the oven. r

The top of the oven, as seen in Fig; 6, has its asbestos Wall supportedby a sheet-metal plate B, which is formed similar tothe sheets 13,except that thepart b has a downturned flange 5 which enters the top ofthe chamber 1) in the end walls. The flange beingturned down from themetal, opens a communication between the chamber 1) in the end walls andthe top chamber, thus furnishing continuous air-chambers around the endsand top of the oven-walls for the heated vapors. The front chamber 1) ofthe top and the top asbestos plate are perforated and provided withregisters by which the heated vapors passing through said chamber may beconducted into the oven or the vapors from the oven and heated vapors inthe chambers conducted to the open air, as desired. This arrangement isshown in Figs. 2 and 7 and will now be described. v j f D and D are theregister-valves, D controlling the opening through the chamberwall b andD controlling the opening through the asbestos sheet; These valves areconnected by the pivot d, which turns in the metal wall Zr", and by thehandle (1. The valves D and D are so arranged that the valve D opens inadvance of the valve D, so that when it is desired to throw the heatedvapors into the even a partial movement of the handle d will open thevalve 1) without uncovering the opening in the asbestos sheet, and if itis desired to allow the vapors from the oven and the heated vapors fromthe air-chamber to pass to the open air, a further movement of thehandle (1 partially uncovers the opening in the asbestos sheet and fullyuncovers the opening from the oven, as seen in diagram view, Fig. 7.

Itis often desirable to admit the vapors from the flame directly to theoven and at other times to exclude them and heat the oven by radiationfrom the inner walls. The means by which these different results areattained I will now describe.

The shelf 0 has a central rectangular opening through it adapted to beopened or closed by a swinging plate or valve E. This valve is hung upona crank-sh aft 6 by means of hangers e. The inner end of the crank-shaftis journaled in a lug upon the bottom or shelf 0 and has an angular bendoutside of its journal to stop the rotation of the shaft in its lowerposition, as clearly seen in Fig. 1. The forward end of the crank-shaftextends through the front wall of the oven and is provided with a handle6 by which the crankshaft is rocked. (See Fig. 3.) By throwing the crankportion of the shaft to its highest position the valve or plate E closesthe bottom, so that the heat from the burner must pass around the oven,through the live-air chamber 1), and also the dead air chamber b at theback of the even, as seen in full line, Figs. 2 and 3. When it isdesired to admit the heated vapors from the burner through the oven, thecrank portion of the shaft is thrown to its lower position, the plate Ethen acting as a deflector. In this position the bottom plate 0 is open,as seen in full line, Fig. 1, and in dotted lines, Figs. 2 and 3. Thebottom of the oven F is a plain sheet of metal, having its forward en dturned up to the lower edge of the door-opening and around the innerasbestos strip A, the rear and end walls being turned over the asbestosplates A. This lower plate is centrally perforated at f to sit over theburner.

The back of the oven is formed like the top, except that there are nodownturned flanges b and its chambers b are practically deadairchambers. The door G is formed like the end walls, except that itssheet-metal lining B has its horizontal edges turned over to incase thehorizontal edges of the asbestos cover A The door is united to the ovenat its lower edge by the hinges g, Fig. 3.

In constructing my oven the sheet-metal frames B and B are first bent tothe form shown, after which the asbestos sheet-s A are slipped intotheir seats and secured to the sheet-metal frames by rivets 19 Thebottom F,which is of sheet metal, has its front end and back edgesturned up at a right angle to the bottom. The vertical end and backframes,

so formed, are set on the bottom, their outer walls bearing against theupturned flanges, to which they are secured. The top is then put inposition, with the flanges b' entering the air-chambers and bearingagainsttheir inner walls. The angle finishing-strips Z) are then placedover the corners and secured in position,aftcr which the lower shelf 0is placed in position with the swinging valve fixed upon it, the doorhinged to the front upturned end of the bottom, and the oven completed.

It is obvious that the form of the metal casing may be varied, and thevertical joints Z) maybe made in a curved or ogee form instead ofangular rabbets, as shown, and that differ ent forms of registers orvalves may be substituted in the structure for those illustrated in thedrawings without departing from the principle or scope of the invention.

That I claim is 1. In an oven for vapor or gas stoves, the combinationof the sheet-metal frames forming the end and back walls, having theirvertical edges bent around to form grooves to hold the asbestos sheetsforming the outer coverin g, the inner walls bent to bear against theinside of the covering and form between said bends air-chambers, theasbestos sheets held in said frames and secured thereto by rivets, thetop of the oven having frames similarly formed and the end walls of itsair-chambers turned down to bear against the wall of the air-chamberinthe end pieces,and an gle-strips overlapping the corners for securingthe walls together, substantially as shown and described.

2. The combination of the outer non-conducting walls formed of asbestosor similar material, the sheet-metal frames incasing and holding saidasbestos sheets and forming airchambers between said sheets and the ovenproper, the vertical end and back walls of the air-chambers beingperforated and having inturned lugs to support the lower shelf of theoven, the ends of the top air-chamber being turned down to bear againstthe walls of the vertical air-chamber in the oven ends, the shelfresting upon said lower lugs and centrally perforated, and the swingingvalve to open or close said perforation for the purpose of admitting theheat from the burner to the oven, or excluding it therefrom,substantially as shown and described.

Thecombination of the oven, communicating air-chambers surrounding theend and top walls, the top wall of one of the air-chambers and the topcover being perforated, connected valves controlling said openings orperforations for the purpose of conducting the heated vapors into theoven or from the oven to the open air, substantially as shown anddescribed.

LUD WIG LENTZ.

Witnesses:

Gno. J. MURRAY, EMMA. LYFORD.

